-3x-21=6x+15

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Solution for -3x-21=6x+15 equation:


Simplifying
-3x + -21 = 6x + 15

Reorder the terms:
-21 + -3x = 6x + 15

Reorder the terms:
-21 + -3x = 15 + 6x

Solving
-21 + -3x = 15 + 6x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-6x' to each side of the equation.
-21 + -3x + -6x = 15 + 6x + -6x

Combine like terms: -3x + -6x = -9x
-21 + -9x = 15 + 6x + -6x

Combine like terms: 6x + -6x = 0
-21 + -9x = 15 + 0
-21 + -9x = 15

Add '21' to each side of the equation.
-21 + 21 + -9x = 15 + 21

Combine like terms: -21 + 21 = 0
0 + -9x = 15 + 21
-9x = 15 + 21

Combine like terms: 15 + 21 = 36
-9x = 36

Divide each side by '-9'.
x = -4

Simplifying
x = -4

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